Transmit Power Allocation for Precoded Distributed MIMO OFDM Systems
Transmit Power Allocation for Precoded Distributed MIMO OFDM Systems
复制标题
预编码分布式 MIMO OFDM 系统的发射功率分配
DOI：
10.1109/aina.2010.135
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
A. Gameiro
中科院分区：
文献类型：
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作者：
R. Holakouei;Adão Silva;A. Gameiro
该文研究了一种新的分布式MIMO OFDM系统下行链路多用户线性预编码技术。我们考虑一个分布式宽带无线系统，其中一些基站是透明的光纤连接到一个中央单元。我们进一步假设用户终端配备有天线阵列，并且分布式基站配备有单个天线阵列或天线阵列。该架构提供高速回程信道，从而允许高效的联合多小区处理。所提出的功率分配算法是基于最小化的总和的逆信号噪声比（SNR-1）的每个用户终端上的可用的子载波。最小化SNR-1而不是误比特率（BER）的和的动机在于，第一准则实现了封闭形式的解，这从实用的角度来看更有趣。目的是提出一种实用的分布式预编码技术，以消除小区间干扰，提高用户在小区边缘的公平性。所提出的方案的性能进行评估，考虑典型的行人的情况下，基于LTE规范。
This paper deals with a new multi-user linear precoding technique for downlink of distributed MIMO OFDM systems. We consider a distributed broadband wireless system where some base stations are transparently linked by optical fiber to a central unit. We further assume that the user terminals are equipped with an antenna array and the distributed base stations equipped with either single or an antenna array. This architecture provides a high speed backhaul channel allowing an efficient joint multi-cell processing. The proposed power allocation algorithm is based on minimization of the sum of inverse signal-to-noise ratio (SNR-1) on each user terminal over the available subcarriers. The motivation to minimize the sum of SNR-1 instead of bit error rate (BER) is in the fact that the first criterion achieves a closed-form solution, which is more interesting from practical point of view. The aim is to propose a practical distributed precoding technique to remove the inter-cell interference and improve the user’s fairness at the cell-edges. The performance of the proposed scheme is evaluated, considering typical pedestrian scenarios based on LTE specifications.